Im a bit tall and starting to feel the effects of sitting all day... lower back pain mostly, so im looking to add a machine to strengthen my back and core alongside squats and deadlifts. I used to love the 45degree hyper extension and found a great deal on a solid one. A GHD is also on the table, but its over 3 times the price. Space isn't an issue, just trying to figure out if the GHD is really worth the extra cost.